This is what the Milky Way's magnetic field looks like:
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The Planck satellite constructed all-sky maps of the sky in nine different wavelengths of light, at frequencies spanning from 30 GHz all the way up to 857 GHz: frequencies that can only be observed from space. Although the foreground features in the Milky Way are quite prominent, the main science goal of Planck was to analyze the background light: the cosmic microwave background.
This map is of the galactic magnetic foreground of the Milky Way. The contour lines show the direction of the magnetic field projected on the plane of the sky, while light/dark regions correspond to fully-unpolarized/fully-polarized regions of emission from the galaxy.. A close-up view of one of many regions of our galaxy, with the dustiest regions shown in red. The dark red regions are locations where new stars are forming, and the contour lines that show the reconstructed magnetic fields from our galaxy illustrate the interplay of star-forming regions with these fields.
ESA/Planck Collaboration. Acknowledgment: M.-A. Miville-Deschênes, CNRS – Institut d’Astrophysique Spatiale, Université Paris-XI, Orsay, France
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